From: asterix <asterix@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Tue, 28 Sep 2010 10:58:58 +0000 (+0000)
Subject: Complete adc support for lm3s family.
X-Git-Tag: 2.6.0~74
X-Git-Url: https://codewiz.org/gitweb?a=commitdiff_plain;h=10cfb24580ac9720265e3a43448ccfd0b81ec49b;p=bertos.git

Complete adc support for lm3s family.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@4327 38d2e660-2303-0410-9eaa-f027e97ec537
---

diff --git a/bertos/cpu/cortex-m3/drv/adc_lm3s.c b/bertos/cpu/cortex-m3/drv/adc_lm3s.c
index 144b95d6..a59400e0 100644
--- a/bertos/cpu/cortex-m3/drv/adc_lm3s.c
+++ b/bertos/cpu/cortex-m3/drv/adc_lm3s.c
@@ -62,11 +62,20 @@
 #include <cfg/log.h>
 
 #include <drv/adc.h>
-#include <drv/clock_stm32.h>
-#include <drv/gpio_stm32.h>
+#include <drv/timer.h>
+#include <drv/clock_lm3s.h>
 
 #include <io/lm3s.h>
 
+/* Select witch ADC use */
+#if CPU_CM3_LM3S1968 || CPU_CM3_LM3S8962
+	#define ADC_BASE            ADC0_BASE
+	#define SYSCTL_RCGC_R       SYSCTL_RCGC0_R
+	#define SYSCTL_RCGC_ADC     SYSCTL_RCGC0_ADC0
+#else
+	#error Unknow ADC register for select cpu core
+#endif
+
 
 #if CONFIG_KERN
 	#include <cfg/module.h>
@@ -96,12 +105,19 @@
 		sig_post(adc_process, SIG_ADC_COMPLETE);
 
 		/* Clear the status bit */
+		HWREG(ADC_BASE + ADC_O_ISC) |= ADC_ISC_IN3;
+
 	}
 
 	static void adc_enable_irq(void)
 	{
+		/* Clear all pending irq */
+		HWREG(ADC_BASE + ADC_O_ISC) = 0;
 		/* Register the IRQ handler */
-		//sysirq_setHandler(ADC_IRQHANDLER, adc_conversion_end_irq);
+		sysirq_setHandler(INT_ADC3, adc_conversion_end_irq);
+		/* Enable IRQ */
+		HWREG(ADC_BASE + ADC_O_SSCTL3) |= ADC_SSCTL3_IE0;
+		HWREG(ADC_BASE + ADC_O_IM) |= ADC_IM_MASK3;
 	}
 
 #endif /* CONFIG_KERN */
@@ -115,7 +131,12 @@
  */
 void adc_hw_select_ch(uint8_t ch)
 {
-	/* We sample only from one channel */
+	/* Select channel that we want read */
+	HWREG(ADC_BASE + ADC_O_SSMUX3) = ch;
+	/* Make single acquisition */
+	HWREG(ADC_BASE + ADC_O_SSCTL3) |= ADC_SSCTL3_END0;
+	/* Enable sequence S03 (single sample on select channel) */
+	HWREG(ADC_BASE + ADC_O_ACTSS) |= ADC_ACTSS_ASEN3;
 }
 
 /**
@@ -132,7 +153,7 @@ uint16_t adc_hw_read(void)
 	#endif
 
 	/* Start convertion */
-    adc->CR2 |= CR2_EXTTRIG_SWSTRT_SET;
+	HWREG(ADC0_BASE + ADC_O_PSSI) |= ADC_PSSI_SS3;
 
 	#if CONFIG_KERN
 		/* Ensure IRQs enabled. */
@@ -140,16 +161,16 @@ uint16_t adc_hw_read(void)
 		sig_wait(SIG_ADC_COMPLETE);
 
 		/* Prevent race condition in case of preemptive kernel */
-
+		uint16_t ret = (uint16_t)HWREG(ADC_BASE + ADC_O_SSFIFO3);
 		MEMORY_BARRIER;
 		adc_process = NULL;
 		return ret;
 	#else
 		/* Wait in polling until conversion is done */
-		//while (!(adc->SR & BV(SR_EOC)));
+		while (!(HWREG(ADC_BASE + ADC_O_SSFSTAT3) & ADC_SSFSTAT3_FULL));
 
 		/* Return the last converted data */
-		return 0;
+		return (uint16_t)HWREG(ADC_BASE + ADC_O_SSFIFO3);
 	#endif
 }
 
@@ -158,9 +179,19 @@ uint16_t adc_hw_read(void)
  */
 void adc_hw_init(void)
 {
+	/* Enable ADC0 clock */
+	SYSCTL_RCGC_R |= SYSCTL_RCGC_ADC;
 
+	/*
+	 * We wait some time because the clock is istable
+	 * and that could cause system hardfault
+	 */
+	lm3s_busyWait(10);
 
-
+	/* Disable all sequence */
+	HWREG(ADC_BASE + ADC_O_ACTSS) = 0;
+	/* Set trigger event to programmed (for all sequence) */
+	HWREG(ADC_BASE + ADC_O_EMUX) = 0;
 
 	#if CONFIG_KERN
 		adc_enable_irq();
diff --git a/bertos/cpu/cortex-m3/drv/adc_lm3s.h b/bertos/cpu/cortex-m3/drv/adc_lm3s.h
index ae677c54..1ffe33f4 100644
--- a/bertos/cpu/cortex-m3/drv/adc_lm3s.h
+++ b/bertos/cpu/cortex-m3/drv/adc_lm3s.h
@@ -45,15 +45,13 @@
 /**
  * ADC config define.
  */
-#define ADC_MUX_MAXCH         17 //Max number of channel for ADC.
-#define ADC_BITS              10 //Bit resolution for ADC converter.
-
-/**
- * Define PIO controller for enable ADC function.
- * \{
- */
-
-/*\}*/
+#if CPU_CM3_LM3S1968
+	#define ADC_MUX_MAXCH          8 //Max number of channel for ADC.
+	#define ADC_BITS              10 //Bit resolution for ADC converter.
+#elif CPU_CM3_LM3S8962
+	#define ADC_MUX_MAXCH          4 //Max number of channel for ADC.
+	#define ADC_BITS              10 //Bit resolution for ADC convert
+#endif
 
 /**
  * Init the ADC pins.